sit-ski
n.— «Of course, this is done while skiers are strapped into a seat and perched atop a shock absorber and a single ski. The rig is sometimes called a “sit-ski.”» —“Winter X Games: One ski, but twice the fun” by Ken Gordon Columbus Dispatch (Ohio) Jan. 24, 2008. (source: Double-Tongued Dictionary)
Further reading
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For rock climbers, skiers, and other outdoor enthusiasts, the word send has taken on a whole new meaning. You might cheer on a fellow snowboarder with Send it, bro! — and being sendy is a really great thing. Plus: a nostalgic trip to Willa...